Which of the following indicates a potential speech or language problem?

Not using any speech by age two clearly indicates a potential speech or language problem. By this age milestone, children typically begin to communicate with others and express their needs and thoughts verbally. The absence of any speech could suggest delays in language development, which may warrant further assessment or intervention.

In contrast, using two-word sentences by age two is a normal and expected development, as is speaking in complex sentences by age three, which reflects language growth. Likewise, clear articulation of words signifies that a child is progressing well in their speech development. Therefore, the lack of any verbal communication at this stage raises significant concerns for a child's speech and language skills, making it a critical indicator for potential issues.